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From: "Andrzej Hunt via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Josh Steadmon <steadmon@google.com>,
	Andrzej Hunt <andrzej@ahunt.org>,
	Andrzej Hunt <ajrhunt@google.com>
Subject: [PATCH] Update 'make fuzz-all' docs to reflect modern clang
Date: Sun, 28 Feb 2021 12:22:38 +0000	[thread overview]
Message-ID: <pull.889.git.1614514959347.gitgitgadget@gmail.com> (raw)

From: Andrzej Hunt <ajrhunt@google.com>

Clang no longer produces a libFuzzer.a, instead you can include
libFuzzer by using -fsanitize=fuzzer. Therefore we should use
that in the example command for building fuzzers.

I happen to have tested with LLVM 11 - however -fsanitize=fuzzer appears to
work in a wide range of reasonably modern clangs.

(On my system what used to be libFuzzer.a now lives under the following path,
 which is tricky albeit not impossible for a novice such as myself to find:
/usr/lib64/clang/11.0.0/lib/linux/libclang_rt.fuzzer-x86_64.a )

Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
---
    Update 'make fuzz-all' docs to reflect modern clang
    
    I would like to update the examples for 'make fuzz-all' to make it
    easier to build fuzzers locally.
    
    This change should make it easier for the uninitiated to build fuzzers
    locally without first having to figure out what LIB_FUZZING_ENGINE is
    for.
    
    ATB, Andrzej

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-889%2Fahunt%2Ffuzz-docs-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-889/ahunt/fuzz-docs-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/889

 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 9b1bde2e0e64..9f8f459f87b4 100644
--- a/Makefile
+++ b/Makefile
@@ -3291,11 +3291,11 @@ cover_db_html: cover_db
 # are not necessarily appropriate for general builds, and that vary greatly
 # depending on the compiler version used.
 #
-# An example command to build against libFuzzer from LLVM 4.0.0:
+# An example command to build against libFuzzer from LLVM 11.0.0:
 #
 # make CC=clang CXX=clang++ \
 #      CFLAGS="-fsanitize-coverage=trace-pc-guard -fsanitize=address" \
-#      LIB_FUZZING_ENGINE=/usr/lib/llvm-4.0/lib/libFuzzer.a \
+#      LIB_FUZZING_ENGINE=-fsanitize=fuzzer \
 #      fuzz-all
 #
 FUZZ_CXXFLAGS ?= $(CFLAGS)

base-commit: 225365fb5195e804274ab569ac3cc4919451dc7f
-- 
gitgitgadget

             reply	other threads:[~2021-02-28 12:25 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-28 12:22 Andrzej Hunt via GitGitGadget [this message]
2021-03-01 22:39 ` [PATCH] Update 'make fuzz-all' docs to reflect modern clang Josh Steadmon
2021-03-04 15:26   ` Andrzej Hunt
2021-03-04 15:28 ` [PATCH v2] " Andrzej Hunt via GitGitGadget
2021-03-04 22:48   ` Junio C Hamano
2021-03-08 17:05     ` Andrzej Hunt
2021-03-08 18:28       ` Junio C Hamano
2021-03-10 18:50     ` Josh Steadmon
2021-03-08 17:14   ` [PATCH v3] Makefile: update " Andrzej Hunt via GitGitGadget
2021-03-10 18:52     ` Josh Steadmon

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